JPH0322287Y2 - - Google Patents

Description

[Detailed explanation of the idea]

<Field to which the invention pertains> The present invention relates to an extensible textured yarn for molded sheets (hereinafter sometimes simply referred to as "extensible textured yarn"). More specifically, the present invention relates to an extensible textured yarn that imparts smooth bendability (moldability) and a desirable texture to a fabric. <Prior art> Sheet materials made of fiber materials (hereinafter referred to as car sheet materials) are used for vehicle seats and vehicle doors. It is made up of processed crimped yarn). Car seat materials made of such crimped yarns have a bulky feel, which gives them a favorable appearance or feel when sitting on them.
However, as is well known, it is essential that car seat members be molded into the shape that will fit inside a vehicle, and crimped yarns do not have a sufficient function in terms of moldability. In addition, a fabric is also known in which a tricot yarn consisting of two types of filament yarns (flat yarn) is arranged with an intermediately oriented synthetic fiber yarn in one of the filament yarns, but this fabric is not bulky and has a satisfactory texture. It's not a thing. <Purpose> The purpose of the present invention is to overcome the drawbacks of conventional car seat materials, which are excellent in texture but lack functionality in terms of moldability, and to provide a processed yarn for molded seats that has both performances. It's about doing. <Structure> The present invention focuses on two-feed taslan yarn, especially Two Feed taslan yarn with a core-sheath structure, which has bulkiness similar to crimped yarn. This purpose was achieved by using heat-treated yarn. Thus, according to the present invention, a mixed fiber with a core-sheath structure having a yarn foot difference and loops and slacks on the yarn surface.
It is an interlaced yarn and the core yarn has a boiling water shrinkage rate of 10% or less,
There is provided an extensible processed yarn for a molded sheet, characterized in that it is made of a heat-treated intermediately oriented synthetic fiber yarn having an elongation of 70% or more. The present invention will be explained below with reference to the accompanying drawings. In the figure, 1 is a side view of the Two Feed Taslan yarn, which has a filament yarn 2 in the core, and loops and slack 3 formed by the filaments on the yarn surface.
It consists of a filament thread 4 of a sheath forming a sheath. In the present invention, a heat-treated synthetic fiber intermediately oriented yarn is used as the filament yarn (core yarn) of the core. Here, the core yarn is 10%
It is necessary to simultaneously satisfy the following conditions of boiling water shrinkage and elongation of 70% or more. This boiling water shrinkage rate of 10% or less is an essential requirement from the perspective of preventing staining. Generally, the processed yarn of the present invention is subjected to cheese dyeing in the state of overfeed-wound cheese, but at this time, the boiling water shrinkage rate of the yarn is
If it exceeds 10%, excessive shrinkage spots will occur between the inner and outer layers of cheese, resulting in only processed yarn with dyed spots. Ordinary intermediately oriented yarns have large values for both elongation and boiling water shrinkage. For example, an intermediately oriented polyester yarn (245de/48fil) obtained at a spinning speed of around 3000 m/min has a boiling water shrinkage rate of around 60% and an elongation of around 140%, and such yarns are outside the scope of the present invention. In the present invention, such intermediately oriented yarns are heat-treated to adjust boiling water shrinkage to 10% or less, while maintaining elongation at a level of 70% or more necessary to obtain mold conformability. An example of heat treatment conditions (using a hollow pipe heater) for making the intermediately oriented yarn into a low shrinkage, high elongation yarn is shown below.

[Table] The heat-treated intermediately oriented yarn is preferably made of polyester, polyamide, etc., and has a birefringence in the range of 0.025 to 0.8. When the birefringence becomes less than 0.025,
Practical physical properties of the core yarn itself cannot be ensured, and on the other hand, if the refractive index exceeds 0.8, the elongation becomes too low and the extensibility becomes poor, making it impossible to obtain mold followability during molding. On the other hand, as the filament yarn (sheath yarn) 3 of the sheath portion, a drawn yarn made of polyester, polyamide, etc. is generally used, which has lower elongation than the core yarn and has higher practical physical properties. In the case of such Two Feed Taslan yarn, it is generally preferable that the processed yarn elongation is 40 or more, and in order to ensure the bulky texture of the yarn as a whole and the integrity of the core yarn with the sheath yarn, There is also a preferable range for the relaxation rate (overfeed rate) of both yarns.
In general, when the relaxation rate of the core yarn increases, undesirable phenomena (for example, some of the filaments of the core yarn become loops or slacks and appear on the yarn surface) occur. It is appropriate to suppress the relaxation rate to a level (8% at most) that ensures the following. On the other hand, the relaxation rate of the sheath yarn is preferably in the range of 50 to 200%, since it is necessary to form loops of sufficient and appropriate size to obtain bulkiness and texture. If it is less than 50%, the number of loops and slacks will be small and sufficient bulkiness will not be obtained. On the other hand, if the relaxation rate exceeds 200%, the loop size will become too large or a long "sag" will occur, which will impair the appearance of the processed yarn. It has also been found that a car seat material with excellent moldability can be obtained when the difference in yarn length between the core yarn and the sheath yarn in the Taslan yarn is generally in the range of 10 to 248%. In addition, the denier ratio of core thread and sheath thread is 1:3.
5:1, and the denier and number of filaments of each yarn may be appropriately selected from the following ranges. [Core yarn] ・Denier: 50-900 ・Number of filaments: 24-72 [Sheath yarn] ・Denier: 75-500 ・Number of filaments: 24-192 In order to obtain the extensible textured yarn according to the present invention, known methods are used. Using two-feed type Taslan processing equipment,
In this case, the core yarn may be fed to the same taslan nozzle under an overfeed of 2 to 10% or less, and the sheath yarn may be fed to the same taslan nozzle under an overfeed of 20 to 250%, as described above. <Function/Effect> As is well known, Taslan yarn, which is composed of a single multifilament yarn, has a problem with so-called loop stability, in which when a load above a certain level is applied, the filaments slip and the loops disappear. It was hot. Therefore, we decided to divide the functions by giving the core yarn the function of carrying this load, and placing the sheath yarn on the other hand to form the loops and slack.
Two Feed Taslan yarn. Therefore, in the case of such Taslan yarns, it was a prerequisite that the core yarn would not stretch in order to stabilize the loop. However, in the present invention, going against this concept, the core yarn is a heat-treated synthetic fiber intermediately oriented yarn, which is physically much more stable than an undrawn yarn, and on the other hand, compared to a drawn yarn in terms of elongation. This method uses larger threads, and this provides the following remarkable effects. Since it is easy to stretch from the core yarn itself, loops,
The elongation tension on the sheath filament, which forms slack, is reduced. Therefore, the fabric made from the processed yarn of the present invention not only has excellent mold followability during molding, but also reduces the degree of disappearance of loops and sagging caused by molding (compared to when the drawn yarn is the core yarn). (The bulky texture of the processed yarn is maintained accordingly. The heat-treated intermediate oriented yarn that is the core yarn has a higher dyeing rate than the drawn yarn that is normally used as the sheath yarn. Since there is a core part that is dyed, the depth of the color is rich in elegance, and the interior effect inside the vehicle is greatly improved.

[Brief explanation of the drawing]

The accompanying drawing is a side view of the extensible textured yarn according to the present invention. 1...Extensible processed yarn (Two Feed Taslan yarn),
2...Filament in the core, 3...Loop and slack due to the filament in the sheath, 4...Filament in the sheath.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A mixed fiber/entangled yarn with a core-sheath structure having a yarn length difference and loops and slacks on the yarn surface, where the core yarn is
An extensible processed yarn for a molded sheet, characterized by comprising a heat-treated intermediately oriented synthetic fiber yarn having a boiling water shrinkage rate of 10% or less and an elongation of 70% or more. (2) Scope of Utility Model Registration Claim No. (1) in which the core yarn is a polyester intermediately oriented yarn with a boiling water shrinkage rate of 6% or less
Extensible processed yarn for molded sheets as described in Section 1. (3) The extensible processed yarn for a molded sheet according to claim 1, wherein the core yarn is an intermediately oriented polyamide yarn with a boiling water shrinkage rate of 6% or less. (4) The extensible processed yarn for a molded sheet according to claim 1 or 2, wherein the core yarn is an intermediately oriented polyester yarn with an elongation of 90% to 180%. (5) The extensible processed yarn for a molded sheet according to claim 1 or 3, wherein the core yarn is a medium oriented polyamide yarn with an elongation of 90% to 180%. (6) The extensible processed yarn for a molded sheet according to claim (1) of the utility model registration claim, wherein the sheath yarn is a drawn polyester yarn. (7) The extensible processed yarn for a molded sheet according to claim (1) of the utility model registration, wherein the core yarn has a relaxation rate of 2% to 10%. (8) The extensible processed yarn for a molded sheet according to claim (1) of the utility model registration, wherein the sheath yarn has a relaxation rate of 20% to 250%. (9) The extensible textured yarn for a molded sheet according to claim (1), wherein the difference in yarn length between the core yarn and the sheath yarn is 10% to 248%.